Haha, don't worry dude, many people that use these forums tend to get good marks because they get tips from everyone, etc/ Know how to use the system in their favour.
If you are the only student in the course, or the first in the course, you will get the highest HSC exam mark from the cohort.
If you are the only person, your cohort exists of one person.
The assessment mark will be moderated to your exam mark in the circumstance of you being the only one...